/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright (c) 2008-2009, The KiWi Project (http://www.kiwi-project.eu)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of the KiWi Project nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Contributor(s):
 * sschaffe
 * 
 */
package kiwi.core.services.persistence;

import kiwi.core.api.persistence.PersistenceService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.PreDestroy;
import javax.enterprise.context.ApplicationScoped;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.FlushModeType;
import javax.persistence.Persistence;
import java.io.Serializable;

/**
 * PersistenceServiceImpl
 *
 * @author Sebastian Schaffert
 *
 */
@ApplicationScoped
public class PersistenceServiceImpl implements PersistenceService, Serializable {

	private EntityManagerFactory emf;

	private Logger log = LoggerFactory.getLogger(PersistenceServiceImpl.class);
	
	public PersistenceServiceImpl() {
		log.info("setting up new persistence service");
		
		log.info("initialising entity manager factory");
		emf = Persistence.createEntityManagerFactory("KiWi");
	}
	
	/**
	 * Return a new entity manager instance; flush mode is manual commit.
	 * 
	 * @see kiwi.core.api.persistence.PersistenceService#getEntityManager()
	 */
	public EntityManager getEntityManager() {
        EntityManager em  = emf.createEntityManager();
        em.setFlushMode(FlushModeType.COMMIT);
 		return em;
	}


    /**
     * Close the entity manager passed as argument.
     * @param em
     */
    @Override
    public void closeEntityManager(EntityManager em) {
        em.close();
    }





 	@PreDestroy
	public void shutdown() {
		log.info("shutting down persistence service");
        if(emf.isOpen()) {
		    emf.close();
        }
		log.info("destroyed entity manager factory");
	}
}
